10. Fault Indication and Fault Analysis:
Fault No.
Nature of Fault
Cause
Remedy
1
Temperature inside the enclosure
too high
Cooling output too low (lack of coolant)
Consequential fault or faults 2 – 7
Check cooling output
Carry out cooling service
2
Compressor
Compressor overloaded
(internal winding protection)
Unit will switch on automatically
Defect (check by measuring the resistance
of the winding)
Replace as part of cooling service
Relay or feed cable faulty
Replace power PCB
3
Evaporator
Operational indication if risk of icing up exists
Raise the setpoint value of the internal
temperature of enclosure
Lack of coolant
Carry out of cooling service
4
High-pressure monitor
Ambient temperature too high
Unit’s specified range of application exceeded
Condenser contaminated
Clean
Filter mat contaminated
Clean or replace
Condenser fan defective
Replace
“E” valve defective
Carry out of cooling service
Defective
Replace as part of cooling service
5
Condenser fan
Blocked or defective
Replace
6
Evaporator fan
Blocked or defective
Replace
7
Filter monitoring
Filter mat contaminated
Clean or replace
8
Temperature sensor
Cable break or short-circuit
Replace
9
Phase monitoring
Incorrect field of rotation
Reverse two phases
9
11. Programming (Tab. 5.1)
Pro-
gram
Level
Changeable
Parameter
Min.
Value
Max.
Value
Factory
Setting
Description
1
Internal
enclosure
temperature T
i
30
45
35
The standard thermostat setting range is 35 – 45
°
C. The upper and lower limits can be
adjusted through programm level 5 and 6.
2
Set value of
filter mat
monitor
4
40
(99 =
off)
99
Factory setting is the shut off value (99). To activate:
1. Install clean filter mat and let air conditioner cool for a few minutes.
2. Select programm level 2 (see diagram 5.1 page 39).
3. Push test button 10 seconds. Temperature difference is displayed.
4. Using the “
” button adjust the temperature 10 K above the displayed value.
3
Imperial/metric
units
°
C/
°
F
0
1
0
The enclosure temperature can be displayed in both
°
C and
°
F.
4
Security code
123
In order to access program levels 5 – 9 the code “123” must first be entered through program
level 4.
5
Minimum
thermostat
setting
20
35
30
The minimum thermostat setting can be adjusted from 35
°
C to 20
°
C.
6
Maximum
thermostat
setting
40
55
45
The maximum thermostat setting can be adjusted from 40
°
C to 55
°
C.
7
Alarm setting
for enclosure
temperature
3
15
5
Due to the standard factory setting of 5 K the fault code 1 is displayed when the enclosure
temperature is 5 K or more above the thermostat setting. This “alarm temperature” setting can
be adjusted from 3 to 15
°
C.
8
Setting of
PLC interface
0
1
0
The factory setting is for serial interface. Parallel interface is activated by selecting 1.
9
Turn off of
evaporator fan
0
1
0
With the factory setting the evaporator fan turns off for 1 minute each time the unit cycles.
This helps condensate drainage. This feature can be turned off by changing the setting to 1.
➡
